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131
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1 /* ELF program property for Intel CET.
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145
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2 Copyright (C) 2017-2020 Free Software Foundation, Inc.
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131
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3
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4 This file is free software; you can redistribute it and/or modify it
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5 under the terms of the GNU General Public License as published by the
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6 Free Software Foundation; either version 3, or (at your option) any
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7 later version.
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8
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9 This file is distributed in the hope that it will be useful, but
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10 WITHOUT ANY WARRANTY; without even the implied warranty of
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11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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12 General Public License for more details.
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13
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14 Under Section 7 of GPL version 3, you are granted additional
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15 permissions described in the GCC Runtime Library Exception, version
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16 3.1, as published by the Free Software Foundation.
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17
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18 You should have received a copy of the GNU General Public License and
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19 a copy of the GCC Runtime Library Exception along with this program;
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20 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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21 <http://www.gnu.org/licenses/>.
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22 */
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23
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24 /* Add x86 feature with IBT and/or SHSTK bits to ELF program property
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25 if they are enabled. Otherwise, contents in this header file are
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26 unused. Define _CET_ENDBR for assembly codes. _CET_ENDBR should be
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27 placed unconditionally at the entrance of a function whose address
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28 may be taken. */
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29
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30 #ifndef _CET_H_INCLUDED
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31 #define _CET_H_INCLUDED
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32
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33 #ifdef __ASSEMBLER__
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34
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35 # if defined __CET__ && (__CET__ & 1) != 0
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36 # ifdef __x86_64__
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37 # define _CET_ENDBR endbr64
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38 # else
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39 # define _CET_ENDBR endbr32
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40 # endif
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41 # else
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42 # define _CET_ENDBR
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43 # endif
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44
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45 # ifdef __ELF__
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46 # ifdef __CET__
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47 # if (__CET__ & 1) != 0
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48 /* GNU_PROPERTY_X86_FEATURE_1_IBT. */
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49 # define __PROPERTY_IBT 0x1
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50 # else
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51 # define __PROPERTY_IBT 0x0
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52 # endif
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53
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54 # if (__CET__ & 2) != 0
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55 /* GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
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56 # define __PROPERTY_SHSTK 0x2
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57 # else
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58 # define __PROPERTY_SHSTK 0x0
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59 # endif
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60
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61 # define __PROPERTY_BITS (__PROPERTY_IBT | __PROPERTY_SHSTK)
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62
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63 # ifdef __LP64__
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64 # define __PROPERTY_ALIGN 3
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65 # else
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66 # define __PROPERTY_ALIGN 2
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67 # endif
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68
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69 .pushsection ".note.gnu.property", "a"
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70 .p2align __PROPERTY_ALIGN
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71 .long 1f - 0f /* name length. */
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72 .long 4f - 1f /* data length. */
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73 /* NT_GNU_PROPERTY_TYPE_0. */
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74 .long 5 /* note type. */
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75 0:
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76 .asciz "GNU" /* vendor name. */
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77 1:
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78 .p2align __PROPERTY_ALIGN
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79 /* GNU_PROPERTY_X86_FEATURE_1_AND. */
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80 .long 0xc0000002 /* pr_type. */
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81 .long 3f - 2f /* pr_datasz. */
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82 2:
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83 /* GNU_PROPERTY_X86_FEATURE_1_XXX. */
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84 .long __PROPERTY_BITS
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85 3:
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86 .p2align __PROPERTY_ALIGN
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87 4:
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88 .popsection
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89 # endif /* __CET__ */
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90 # endif /* __ELF__ */
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91 #endif /* __ASSEMBLER__ */
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92
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93 #endif /* _CET_H_INCLUDED */
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